Application of Calcium Peroxide for Methane Mitigation in Paddy Fields: Effects of Milk Vetch ( Astragalus sinicus L.) Incorporation

Ying Wang, Zhengdong Su, Jiajia Wang, Tengfei Jiang and Nannan Zhou ()
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Ying Wang: Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Founded by Anhui Province and Ministry of Education, School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China
Zhengdong Su: Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Founded by Anhui Province and Ministry of Education, School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China
Jiajia Wang: Anhui Provincial Key Laboratory of Nutrient Recycling, Resources and Environment, Institute of Soil and Fertilizer, Anhui Academy of Agricultural Sciences, Hefei 230031, China
Tengfei Jiang: Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Founded by Anhui Province and Ministry of Education, School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China
Nannan Zhou: Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Founded by Anhui Province and Ministry of Education, School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China

Agriculture, 2025, vol. 15, issue 5, 1-15

Abstract: Addressing the pressing issue of global warming, sustainable rice cultivation strategies are crucial. Milk vetch (MV), a common green manure in paddies, has been shown to increase CH 4 emissions, necessitating effective mitigation. This two-year field experiment assessed the impact of applying calcium peroxide (CaO 2 ), widely used in wastewater treatment and soil remediation due to its oxygen-releasing properties, on CH 4 emissions in conventional paddy fields (chemical fertilizer-only) and MV-incorporated fields. The results revealed that in conventional paddy fields, CaO 2 application significantly reduced the average CH 4 emissions by 19% without affecting rice yield. Compared with chemical fertilizer alone, MV incorporation increased the average rice yield by 12% but significantly elevated CH 4 emissions. However, in paddy fields with MV incorporation, CaO 2 application significantly reduced CH 4 emissions by 19% while preserving the yield benefits of MV. Soil analyses indicated that MV incorporation led to increased soil carbon content and increased mcrA and pmoA gene copy numbers, with elevated mcrA gene copy numbers being primarily responsible for the promoted CH 4 emissions. CaO 2 application improved the soil redox potential, reducing mcrA gene copies and consequently mitigating CH 4 emissions. Overall, CaO 2 application can contribute to global efforts to reduce CH 4 emissions while supporting rice productivity.

Keywords: calcium peroxide; milk vetch; methane emissions; paddy (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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